<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        //new关键字执行过程
        //1. new 构造函数可以在内存中创建了一个空的对象
        //2. this 就会指向刚才创建的空的对象
        //3. 执行构造函数里面的代码 给这个空对象添加属性和方法
        //4. 返回这个对象 (相当于return)

        function Star(uname, age, sex) {
            this.name = uname;
            this.age = age;
            this.sex = sex;
            this.sing = function(song) {
                console.log(song);
            }
        }
        var ldh = new Star('刘德华', 18, '男');
    </script>
</head>

<body>

</body>

</html>